TF card into device， double-click the function key switch to TF card mode play musicIf you use the product with NFC function， you can take the phone close to the NFC interface， then the Bluetooth of the phone and Bluetooth Music Receiver will pairing automaticallyMulti-function button --- play/stop/ hang up /Double-click the TF mode switchesBluetooth indicator light and 3.5mm audio frequency portNFC function is optional and TF memory card can be inserted